With tax refunds coming it's time for an upgrade. Since I can't do everything I'd like, choices must be made. I'll have about $600 to play with, so would you... Get my 46" Sony RPTV ISF callibrated- or Upgrade my Energy Take 5.2 speaker system with the 8" Energy Sub to an SVS 25-31 PCi- Which do you think would make the better upgrade? Is ISF or SVS more important to the home theater experience. Understand I'll probably do the other choice down the road, but which would make the biggest wow. Bear in mind I'll have to justify this expense to the wife- so which upgrade will she notice more is also an important question. I'm posting this in the Speaker forum too just to get the feelings from that group as well. Thanks for any insight.